Metallic glasses have potential applications as pressure sensors due to their low Young's modulus and high strength. Bulk metallic glasses (BMGs) in particular are well-suited for use as diaphragms in electromagnetic pressure sensors as their sensitivity can be 3.8 times greater than stainless steel. Recent studies have also found BMGs to increase the sensitivity of coriolis mass flow meters by 28 times compared to conventional materials. Additionally, amorphous ferromagnetic ribbons have shown promise for magnetoelastic resonance-based position sensors due to the linear relationship between resonant frequency and applied magnetic field displacement.

1. A brief presentation on
Metallic Glasses for pressure sensors
Course: Advanced Materials and Processes
Vinit Murmu 09MT3017
Piyush Verma 09MT3018
Department of Metallurgical and Materials Engineering
IIT Kharagpur

2. About Electromagnetic Pressure Sensors
 These Pressure sensors uses diaphragm,
conventional is stainless steel (made by cold
forging) .
 Measures the displacement of a diaphragm by
means of changes in inductance.

3. BMG Diaphragm
By Vapour deposition
at low temperature
•Increased sensitivity of the sensor by having a
lower young’s modulus and high strength
material.
•BMG meets this requirement.
•BMGs diaphragm of sensors are made by liquid
forging techniques.
•Zr55Al10Ni5Cu30 have Young modulus 100GPa,
half of steel, and sensitivity 3.8 times that of
stainless steels

4. Relationship between Young's modulus and strength
Recent progress of bulk metallic glasses for strain-sensing devices. N. Nishiyama ,
K .Amiya, A. Inoue

5. CMF-Coriolis Mass Flowmeter
Recent progress of bulk metallic glasses for strain-sensing devices. N. Nishiyama ,
K .Amiya, A. Inoue

6. • Comparison of sensitivity of Ti41.5Zr2.5Hf5Cu42.5Ni7.5Si1 and
conventional SUS316L pipe.
• Linear correlation coefficients of the data are evaluated to be
0.9997 for Ti-based BMG and 0.997 for conventional pipe.
• BMG alloy found to be 28 times more sensitive
Recent progress of bulk metallic glasses for strain-sensing devices. N. Nishiyama ,
K .Amiya, A. Inoue

7. New sensors based on the magnetoelastic resonance
of metallic glasses
 A magnetoelastic material changes its dimensions when
it is exposed to a magnetic field.
We present the response of ME resonators based on amorphous
ferromagnetic ribbons to the position of a moving magnet
which produces a field varying largely in the ribbon dimensions
New sensors based on the magnetoelastic resonance of metallic glasses. J.M.
Barandiaran, J. Gutierrez, C. Gomez-Polo

8. Experimental
 8-cm-long strips of Metglas® 2605SC amorphous alloy
(iron-based composition)
saturation magnetostriction, λs=30×10−6
spontaneous magnetization, Js=1.61 T
• Field-annealed for 10 min at 390°C under an static
field H=0.45 T
(gives rise to stripe domain structure that maximizes their
magnetoelastic response.)

9. Results

10. For the first peak a strong linear
behaviour of fr1 and A has been
observed when the magnet is
displaced from/to the center of the
sample.

13. Conclusions
 For the first peak a strong linear behaviour of fr1 and A1 has
been observed when the magnet is displaced from/to the
center of the sample.
 An almost constant signal with a low variation of the
resonant frequency is observed when the magnet is located
close to one end of the sample.

14. Possible Applications
 In any case these effects can be used to detect the presence of
inhomogeneous fields and to sense the variation of other
quantities which can be converted into such fields.
 The direct use of the magnet or the interposition of a soft
magnetic material can be used in proximity sensors.

15. Thank You